The time machine as seen in the movie “The Time Machine”

A subject that has always fascinated me. Will the time machine be invented in the future? If it has already been invented in the future, then why haven’t we seen any time travellers from the future yet? It seems you can’t use a time machine to go back in time to before the time machine was built. You can go anywhere in the future, and come back to where you started, but no further. Which rather neatly explains why no time travellers from our future have yet visited us — because the time machine still hasn’t been invented!

But again, would you think this guy who came from the future would tell anyone of us about it? …if he ever did …then he would be considered crazy and probably sent to a hospital and can’t get out. So this guy could already be here in a hospital or considered crazy. Don’t we now ignore those people who claim they have seen UFOs or have been abducted by Aliens? That could be true but for the time being it sounds too fictional for us to believe.

I also have read that our world consists of multiple parallel Universes. According to one interpretation of quantum theory, each of these parallel worlds is just as real as our own, and there is an alternative history for every possible outcome of every decision ever made. So for example if you go back in time and convince yourself to, for example, not get your B.S. degree; here you have created a parallel world with a different reality.So in other worlds you could be a King, a farmer, a businessman, or even a Clerk. As Bizarre as it may sound, this idea is taken seriously by a handful of scientists and it certainly fixes all the time travel paradoxes. The movie “The One” talks about a criminal who escapes from a Universe to another to find his-other-self and kill him to get all his power. And in every universe he finds himself in a different job with a different nationality.

Another example, if you go back in time and prevent your own birth it doesn’t matter, because by that decision you create a new branch of reality, in which you were never born. When you go forward in time, you move up the new branch and find that you never did exist, in that reality; but you were still born and built your time machine in the reality next door. If a traveller goes back and murders his grandfather as a young boy, so the traveller could never have been born, in the many-worlds version, the act of killing creates a new reality, so that when the traveller then goes forward in time he is no longer in his own world, but in the universe “next door”. But it seems that you can’t change fate, I mean like another movie “The Time Machine” talks about a scientist who lost his love in an accident and he spent 4 years building a time machine just to go back to save her. And every-time he did, she died again ..differently. Which gives the idea that you can’t change a definite fate. Basically, you can prevent people from being born but you can’t prevent them from dying.

according to Einstein u need to travel as fast as the speed of light to be able to time travel, which is impossible. which makes time travel impossible too.

This is confusing.. but I can never get enough of this subject.